NTP broadcast mode configuration example

As shown in Figure 39, Switch C functions as the NTP server for multiple devices on a network segment and synchronizes the time among multiple devices.

• Configure Switch C's local clock as a reference source, with stratum level 2.

• Configure Switch C to operate in broadcast server mode and send broadcast messages from VLAN-interface 2.

• Configure Switch A and Switch B to operate in broadcast client mode, and listen to broadcast messages through VLAN-interface 2.

1. Assign an IP address to each interface, and make sure Switch A, Switch B, and Switch C can reach each other, as shown in Figure 39. (Details not shown.)

2. Configure Switch C:

   # Enable the NTP service.

   <SwitchC> system-view
   [SwitchC] ntp-service enable
   

   # Specify the local clock as the reference source, with stratum level 2.

   [SwitchC] ntp-service refclock-master 2
   

   # Configure Switch C to operate in broadcast server mode and send broadcast messages through VLAN-interface 2.

   [SwitchC] interface vlan-interface 2
   [SwitchC-Vlan-interface2] ntp-service broadcast-server
   

3. Configure Switch A:

   # Enable the NTP service.

   <SwitchA> system-view
   [SwitchA] ntp-service enable
   

   # Configure Switch A to operate in broadcast client mode and receive broadcast messages on VLAN-interface 2.

   [SwitchA] interface vlan-interface 2
   [SwitchA-Vlan-interface2] ntp-service broadcast-client
   

4. Configure Switch B:

   # Enable the NTP service.

   <SwitchB> system-view
   [SwitchB] ntp-service enable
   

   # Configure Switch B to operate in broadcast client mode and receive broadcast messages on VLAN-interface 2.

   [SwitchB] interface vlan-interface 2
   [SwitchB-Vlan-interface2] ntp-service broadcast-client
   

5. Verify the configuration:

   # Verify that Switch A has synchronized to Switch C, and the clock stratum level is 3 on Switch A and 2 on Switch C.

   [SwitchA-Vlan-interface2] display ntp-service status
    Clock status: synchronized
    Clock stratum: 3
    System peer: 3.0.1.31
    Local mode: bclient
    Reference clock ID: 3.0.1.31
    Leap indicator: 00
    Clock jitter: 0.044281 s
    Stability: 0.000 pps
    Clock precision: 2^-18
    Root delay: 0.00229 ms
    Root dispersion: 4.12572 ms
    Reference time: d0d289fe.ec43c720  Sat, Jan  8 2011  7:00:14.922
   

   # Verify that an IPv4 NTP association has been established between Switch A and Switch C.

   [SwitchA-Vlan-interface2] display ntp-service sessions
          source          reference       stra reach poll  now offset  delay disper
   ********************************************************************************
    [1245]3.0.1.31        127.127.1.0        2     1   64  519   -0.0 0.0022 4.1257
   Notes: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured.
    Total sessions: 1